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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V.
      6   All rights reserved.
      7 
      8  1.    INTRODUCTION
      9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
     10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
     11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
     12 
     13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
     14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
     15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
     16 of the MPEG specifications.
     17 
     18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
     19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
     20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
     21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
     22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
     23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
     24 
     25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
     26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
     27 applications information and documentation.
     28 
     29 2.    COPYRIGHT LICENSE
     30 
     31 Redistribution and use in source and binary forms, with or without modification, are permitted without
     32 payment of copyright license fees provided that you satisfy the following conditions:
     33 
     34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
     35 your modifications thereto in source code form.
     36 
     37 You must retain the complete text of this software license in the documentation and/or other materials
     38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
     39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
     40 modifications thereto to recipients of copies in binary form.
     41 
     42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
     43 prior written permission.
     44 
     45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
     46 software or your modifications thereto.
     47 
     48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
     49 and the date of any change. For modified versions of the FDK AAC Codec, the term
     50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
     51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
     52 
     53 3.    NO PATENT LICENSE
     54 
     55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
     56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
     57 respect to this software.
     58 
     59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
     60 by appropriate patent licenses.
     61 
     62 4.    DISCLAIMER
     63 
     64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
     65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
     66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
     67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
     68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
     69 or business interruption, however caused and on any theory of liability, whether in contract, strict
     70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
     71 advised of the possibility of such damage.
     72 
     73 5.    CONTACT INFORMATION
     74 
     75 Fraunhofer Institute for Integrated Circuits IIS
     76 Attention: Audio and Multimedia Departments - FDK AAC LL
     77 Am Wolfsmantel 33
     78 91058 Erlangen, Germany
     79 
     80 www.iis.fraunhofer.de/amm
     81 amm-info (at) iis.fraunhofer.de
     82 ----------------------------------------------------------------------------------------------------------- */
     83 
     84 /******************************** MPEG Audio Encoder **************************
     85 
     86    Initial author:       M.Lohwasser
     87    contents/description: PNS parameters depending on bitrate and bandwidth
     88 
     89 ******************************************************************************/
     90 
     91 #include "pnsparam.h"
     92 #include "psy_configuration.h"
     93 
     94 typedef struct {
     95   SHORT     startFreq;
     96   /* Parameters for detection */
     97   FIXP_SGL  refPower;
     98   FIXP_SGL  refTonality;
     99   SHORT     tnsGainThreshold;     /* scaled by TNS_PREDGAIN_SCALE (=1000) */
    100   SHORT     tnsPNSGainThreshold;  /* scaled by TNS_PREDGAIN_SCALE (=1000) */
    101   FIXP_SGL  gapFillThr;
    102   SHORT     minSfbWidth;
    103   USHORT    detectionAlgorithmFlags;
    104 } PNS_INFO_TAB;
    105 
    106 
    107 typedef struct {
    108   ULONG brFrom;
    109   ULONG brTo;
    110   UCHAR S22050;
    111   UCHAR S24000;
    112   UCHAR S32000;
    113   UCHAR S44100;
    114   UCHAR S48000;
    115 } AUTO_PNS_TAB;
    116 
    117 static const AUTO_PNS_TAB levelTable_mono[]= {
    118   {0,      11999, 1, 1, 1, 1, 1,},
    119   {12000,  19999, 1, 1, 1, 1, 1,},
    120   {20000,  28999, 2, 1, 1, 1, 1,},
    121   {29000,  40999, 4, 4, 4, 2, 2,},
    122   {41000,  55999, 9, 9, 7, 7, 7,},
    123   {56000,  79999, 0, 0, 0, 9, 9,},
    124   {80000,  99999, 0, 0, 0, 0, 0,},
    125   {100000,999999, 0, 0, 0, 0, 0,},
    126 };
    127 
    128 static const AUTO_PNS_TAB levelTable_stereo[]= {
    129   {0,      11999, 1, 1, 1, 1, 1,},
    130   {12000,  19999, 3, 1, 1, 1, 1,},
    131   {20000,  28999, 3, 3, 3, 2, 2,},
    132   {29000,  40999, 7, 6, 6, 5, 5,},
    133   {41000,  55999, 9, 9, 7, 7, 7,},
    134   {56000,  79999, 0, 0, 0, 0, 0,},
    135   {80000,  99999, 0, 0, 0, 0, 0,},
    136   {100000,999999, 0, 0, 0, 0, 0,},
    137 };
    138 
    139 
    140 static const PNS_INFO_TAB pnsInfoTab[] = {
    141 /*0   pns off */
    142 /*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8,
    143         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
    144 /*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8,
    145         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
    146 /*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8,
    147         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
    148 /*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
    149         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
    150 /*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
    151         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    152 /*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8,
    153         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    154 /*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8,
    155         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    156 /*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8,
    157         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    158 /*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8,
    159         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    160 };
    161 
    162 static const AUTO_PNS_TAB levelTable_lowComplexity[]= {
    163   {0,      27999, 0, 0, 0, 0, 0,},
    164   {28000,  31999, 2, 2, 2, 2, 2,},
    165   {32000,  47999, 3, 3, 3, 3, 3,},
    166   {48000,  48000, 4, 4, 4, 4, 4,},
    167   {48001, 999999, 0, 0, 0, 0, 0,},
    168 };
    169 
    170 /* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */
    171 static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = {
    172 /*0   pns off */
    173       /* DEFAULT parameter set */
    174 /*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
    175         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    176 /*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
    177         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    178 /*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
    179         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    180       /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */
    181 /*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
    182         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
    183 };
    184 
    185 /****************************************************************************
    186   function to look up used pns level
    187 ****************************************************************************/
    188 int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) {
    189 
    190   int hUsePns=0, size, i;
    191   const AUTO_PNS_TAB *levelTable;
    192 
    193   if (isLC) {
    194     levelTable = &levelTable_lowComplexity[0];
    195     size = sizeof(levelTable_lowComplexity);
    196   } else
    197   { /* (E)LD */
    198     levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0];
    199     size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono);
    200   }
    201 
    202   for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) {
    203     if(((ULONG)bitRate >= levelTable[i].brFrom) &&
    204        ((ULONG)bitRate <= levelTable[i].brTo) )
    205       break;
    206   }
    207 
    208   /* sanity check */
    209   if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) {
    210     return (PNS_TABLE_ERROR);
    211   }
    212 
    213   switch (sampleRate) {
    214   case 22050: hUsePns = levelTable[i].S22050; break;
    215   case 24000: hUsePns = levelTable[i].S24000; break;
    216   case 32000: hUsePns = levelTable[i].S32000; break;
    217   case 44100: hUsePns = levelTable[i].S44100; break;
    218   case 48000: hUsePns = levelTable[i].S48000; break;
    219   default:
    220     if (isLC) {
    221       hUsePns = levelTable[i].S48000;
    222     }
    223     break;
    224   }
    225 
    226   return (hUsePns);
    227 }
    228 
    229 
    230 /*****************************************************************************
    231 
    232     functionname: FDKaacEnc_GetPnsParam
    233     description:  Gets PNS parameters depending on bitrate and bandwidth
    234     returns:      error status
    235     input:        Noiseparams struct, bitrate, sampling rate,
    236                   number of sfb's, pointer to sfb offset
    237     output:       PNS parameters
    238 
    239 *****************************************************************************/
    240 AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np,
    241                                         INT         bitRate,
    242                                         INT         sampleRate,
    243                                         INT         sfbCnt,
    244                                         const INT   *sfbOffset,
    245                                         INT         *usePns,
    246                                         INT         numChan,
    247                                         const int   isLC)
    248 
    249 {
    250     int i, hUsePns;
    251     const PNS_INFO_TAB *pnsInfo;
    252 
    253     if (isLC) {
    254       np->detectionAlgorithmFlags = IS_LOW_COMLEXITY;
    255       pnsInfo = pnsInfoTab_lowComplexity;
    256     }
    257     else
    258     {
    259       np->detectionAlgorithmFlags = 0;
    260       pnsInfo = pnsInfoTab;
    261     }
    262 
    263     if (*usePns<=0)
    264         return AAC_ENC_OK;
    265 
    266     /* new pns params */
    267     hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC);
    268     if (hUsePns == 0) {
    269       *usePns = 0;
    270         return AAC_ENC_OK;
    271         }
    272     if (hUsePns == PNS_TABLE_ERROR)
    273       return AAC_ENC_PNS_TABLE_ERROR;
    274 
    275     /* select correct row of tuning table */
    276     pnsInfo += hUsePns-1;
    277 
    278     np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq,
    279         sampleRate,
    280         sfbCnt,
    281         sfbOffset );
    282 
    283     np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags;
    284 
    285     np->refPower             = FX_SGL2FX_DBL(pnsInfo->refPower);
    286     np->refTonality          = FX_SGL2FX_DBL(pnsInfo->refTonality);
    287     np->tnsGainThreshold     = pnsInfo->tnsGainThreshold;
    288     np->tnsPNSGainThreshold  = pnsInfo->tnsPNSGainThreshold;
    289     np->minSfbWidth          = pnsInfo->minSfbWidth;
    290 
    291     np->gapFillThr           = (FIXP_SGL)pnsInfo->gapFillThr;
    292 
    293     /* assuming a constant dB/Hz slope in the signal's PSD curve,
    294     the detection threshold needs to be corrected for the width of the band */
    295     for ( i = 0; i < (sfbCnt-1); i++)
    296     {
    297         INT qtmp, sfbWidth;
    298         FIXP_DBL tmp;
    299 
    300         sfbWidth = sfbOffset[i+1]-sfbOffset[i];
    301 
    302         tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp);
    303         np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16));
    304     }
    305     np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1];
    306 
    307   return AAC_ENC_OK;
    308 }
    309